Radio-frequency pulse traces in resonant oscillation spectrum of metallic powders

The resonant oscillation of metallic particles, which were electromechanically excited in the radio-frequency (RF) range, was detected. For the Al samples, traces of the pulsed RF magnetic field remained in the absorption spectrum, which is described as hole-burning. We propose that hole-burning is due to the contribution of the dislocation oscillation. However, holes were not detected in the Sn or Nb samples due to the small amplitude of their excited oscillations.